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[/] [scarts/] [trunk/] [toolchain/] [scarts-binutils/] [binutils-2.19.1/] [gold/] [main.cc] - Rev 6
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// main.cc -- gold main function. // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. // Written by Ian Lance Taylor <iant@google.com>. // This file is part of gold. // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, // MA 02110-1301, USA. #include "gold.h" #include <cstdio> #include <cstring> #ifdef HAVE_MALLINFO #include <malloc.h> #endif #include "libiberty.h" #include "script.h" #include "options.h" #include "parameters.h" #include "errors.h" #include "mapfile.h" #include "dirsearch.h" #include "workqueue.h" #include "object.h" #include "archive.h" #include "symtab.h" #include "layout.h" using namespace gold; // This function emits the commandline to a hard-coded file in temp. // This is useful for debugging since ld is typically invoked by gcc, // so its commandline is not always easy to extract. You should be // able to run 'gcc -B... foo.o -o foo' to invoke this linker the // first time, and then /tmp/ld-run-foo.sh to invoke it on subsequent // runes. "/tmp/ld-run-foo.sh debug" will run the linker inside gdb // (or whatever value the environment variable GDB is set to), for // even easier debugging. Since this is a debugging-only tool, and // creates files, it is only turned on when the user explicitly asks // for it, by compiling with -DDEBUG. Do not do this for release // versions of the linker! #ifdef DEBUG #include <stdio.h> #include <sys/stat.h> // for chmod() static std::string collect_argv(int argc, char** argv) { // This is used by write_debug_script(), which wants the unedited argv. std::string args; for (int i = 0; i < argc; ++i) { args.append(" '"); // Now append argv[i], but with all single-quotes escaped const char* argpos = argv[i]; while (1) { const int len = strcspn(argpos, "'"); args.append(argpos, len); if (argpos[len] == '\0') break; args.append("'\"'\"'"); argpos += len + 1; } args.append("'"); } return args; } static void write_debug_script(std::string filename_str, const char* argv_0, const char* args) { size_t slash = filename_str.rfind('/'); if (slash != std::string::npos) filename_str = filename_str.c_str() + slash + 1; filename_str = std::string("/tmp/ld-run-") + filename_str + ".sh"; const char* filename = filename_str.c_str(); FILE* fp = fopen(filename, "w"); if (fp) { fprintf(fp, "[ \"$1\" = debug ]" " && PREFIX=\"${GDB-gdb} --annotate=3 --fullname %s --args\"" " && shift\n", argv_0); fprintf(fp, "$PREFIX%s $*\n", args); fclose(fp); chmod(filename, 0755); } else filename = "[none]"; fprintf(stderr, "Welcome to gold! Commandline written to %s.\n", filename); fflush(stderr); } #else // !defined(DEBUG) static inline std::string collect_argv(int, char**) { return ""; } static inline void write_debug_script(std::string, const char*, const char*) { } #endif // !defined(DEBUG) int main(int argc, char** argv) { #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) setlocale (LC_MESSAGES, ""); #endif #if defined (HAVE_SETLOCALE) setlocale (LC_CTYPE, ""); #endif bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); program_name = argv[0]; // In libiberty; expands @filename to the args in "filename". expandargv(&argc, &argv); // This is used by write_debug_script(), which wants the unedited argv. std::string args = collect_argv(argc, argv); Errors errors(program_name); // Initialize the global parameters, to let random code get to the // errors object. set_parameters_errors(&errors); // Handle the command line options. Command_line command_line; command_line.process(argc - 1, const_cast<const char**>(argv + 1)); long start_time = 0; if (command_line.options().stats()) start_time = get_run_time(); // Store some options in the globally accessible parameters. set_parameters_options(&command_line.options()); // Do this as early as possible (since it prints a welcome message). write_debug_script(command_line.options().output_file_name(), program_name, args.c_str()); // If the user asked for a map file, open it. Mapfile* mapfile = NULL; if (command_line.options().user_set_Map()) { mapfile = new Mapfile(); if (!mapfile->open(command_line.options().Map())) { delete mapfile; mapfile = NULL; } } // The GNU linker ignores version scripts when generating // relocatable output. If we are not compatible, then we break the // Linux kernel build, which uses a linker script with -r which must // not force symbols to be local. It would actually be useful to // permit symbols to be forced local with -r, though, as it would // permit some linker optimizations. Perhaps we need yet another // option to control this. FIXME. if (parameters->options().relocatable()) command_line.script_options().version_script_info()->clear(); // The work queue. Workqueue workqueue(command_line.options()); // The list of input objects. Input_objects input_objects; // The symbol table. We're going to guess here how many symbols // we're going to see based on the number of input files. Even when // this is off, it means at worst we don't quite optimize hashtable // resizing as well as we could have (perhap using more memory). Symbol_table symtab(command_line.number_of_input_files() * 1024, command_line.version_script()); // The layout object. Layout layout(command_line.options(), &command_line.script_options()); // Get the search path from the -L options. Dirsearch search_path; search_path.initialize(&workqueue, &command_line.options().library_path()); // Queue up the first set of tasks. queue_initial_tasks(command_line.options(), search_path, command_line, &workqueue, &input_objects, &symtab, &layout, mapfile); // Run the main task processing loop. workqueue.process(0); if (command_line.options().stats()) { long run_time = get_run_time() - start_time; fprintf(stderr, _("%s: total run time: %ld.%06ld seconds\n"), program_name, run_time / 1000000, run_time % 1000000); #ifdef HAVE_MALLINFO struct mallinfo m = mallinfo(); fprintf(stderr, _("%s: total space allocated by malloc: %d bytes\n"), program_name, m.arena); #endif File_read::print_stats(); Archive::print_stats(); fprintf(stderr, _("%s: output file size: %lld bytes\n"), program_name, static_cast<long long>(layout.output_file_size())); symtab.print_stats(); layout.print_stats(); } if (mapfile != NULL) mapfile->close(); // Issue defined symbol report. if (command_line.options().user_set_print_symbol_counts()) input_objects.print_symbol_counts(&symtab); if (parameters->options().fatal_warnings() && errors.warning_count() > 0 && errors.error_count() == 0) gold_error("treating warnings as errors"); // If the user used --noinhibit-exec, we force the exit status to be // successful. This is compatible with GNU ld. gold_exit(errors.error_count() == 0 || parameters->options().noinhibit_exec()); }